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    Area of Science:

    • Optical Engineering
    • Biomedical Imaging
    • Instrumentation

    Background:

    • Galvanometer-based scanners (GSs) are crucial components in various imaging systems, including optical coherence tomography (OCT).
    • The effective duty cycle of GSs can be influenced by input signal characteristics, scan frequency, and amplitude, potentially affecting imaging performance.

    Purpose of the Study:

    • To experimentally investigate the effective duty cycle of galvanometer-based scanners (GSs).
    • To analyze the impact of scan parameters (duty cycle, frequency, amplitude) on GS performance and OCT imaging quality.
    • To identify and mitigate artifacts caused by GS saturation in OCT imaging.

    Main Methods:

    • Experimental measurements of galvomirror position under varying theoretical duty cycles, scan frequencies, and amplitudes using sawtooth and triangular input signals.
    • Analysis of the mechanical inertia effects on GS performance.
    • Evaluation of OCT imaging artifacts, such as gaps and blurring, in large samples.
    • Determination and implementation of necessary overlap between adjacent B-scans to correct artifacts.

    Main Results:

    • Demonstration of GS saturation at high theoretical duty cycles and scan amplitudes across a range of scan frequencies.
    • Validation of saturation through direct galvomirror position measurements and OCT imaging of large samples.
    • Identification of gaps and blurred regions in OCT images acquired at high scan frequencies using both triangular and sawtooth patterns.
    • Successful acquisition of artifact-free OCT images by implementing appropriate B-scan overlap.

    Conclusions:

    • The effective duty cycle of GSs is limited by mechanical inertia, leading to saturation under specific operating conditions.
    • GS saturation directly impacts OCT imaging quality, causing artifacts that hinder accurate volumetric reconstruction.
    • Optimizing scan parameters and ensuring adequate B-scan overlap are essential for obtaining high-quality, artifact-free OCT images.